Johnson / Evinrude Outboard Power Pack; 6 Cylinder; Digitally controlled CD has a 6100 RPM Limiter (Quick Strike Series has 7500, 8500 and 10,000 RPM Limits Available). SERVICE NOTE: The 6 cylinder Optical ignition packs requires Inductive Spark Plug Wires 931-4921. Replaces: 584910, 584985, 584990, 765387, 18-5887, 9-25027